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  <title>Document</title>
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<body>
  
  <div id="main" style="height: 400px"></div>
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  <script>
    window.onload = function() {
      let myChart = echarts.init(document.getElementById('main'));
      let option = {
        backgroundColor: 'rgba(255, 0, 0, 0.1)',
        grid: {
          show: true,
          backgroundColor: 'rgba(0, 255, 0, 0.1)',
        },
        
        tooltip: {
          position: 'top', // top
        },
        xAxis: {
          data: ['衬衫', '羊毛衫', '雪纺衫', '裤子', '高跟鞋', '袜子']
        },
        yAxis: {},
        series: [
          {
            type: 'bar',
            data: [5, 20, 36, 10, 10, 20]
          }
        ]
      };
      myChart.setOption(option);

      // 1.实现提示框轮播的功能
      setInterval(function () {
        autoToolTip();
      }, 1000);

      let index = 0; // 0-5
      
      function autoToolTip() {
        index++;
        if (index > 5) {
          index = 0;
        }
        // 1.显示提示框
        myChart.dispatchAction({
          type: "showTip", // 触发的action type
          seriesIndex: 0, // 系列的 索引
          dataIndex: index,// 数据项的 索引
          position: "top", // top
        });
      }
    }
  </script>
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